Patching a bicycle inner tube is a valuable skill, especially along side the road. Fortunately, the process is simple, quick and involves only a few tools which can be easily carried while riding.
Step 1 - Finding the Puncture
Remove the hub from the frame with either a wrench or quick release. Using 2 tire irons remove one side of the outer tire from the rim exposing the inner tube. Completely remove the inner tube except for the stem valve. Fill the inner tube to half pressure (road bike 55 psi; mountain bike 35 psi) listening carefully for the leak. When leak is found, hold the spot. Lay the inner tube over the outer tire to locate where the puncture occurred and check inside the outer tire for sharp debris.
Step 2 - Patching the Hole
Scuff the punctured tube around the incision. Smear the glue over scuff, larger than the patch size. Allow glue to dry completely. Remove backing from patch and place firmly over hole. Rub from center out to insure edges have set. Reinsert the inner tube back into the tire and inflate.